Perhaps you should try some spelling variations:
ban hang » ngan hang
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
cac dac » cac dan, cac dai, cac bac
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ky danh » ky anh, ky dang
ma hoi » mai hoi, ma hoa, me hoi
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky danh ((ma hoi) or (xa hoi)). hieu ve cac dac ((va thanh) or (ban hang)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky danh ((ma hoi) OR (xa hoi)). hieu ve cac dac ((va thanh) OR (ban hang)) tai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky danh ((ma hoi) or (xa hoi)). hieu ve cac dac ((va thanh) or (ban hang)) tai cua tre*.